function limit(){
var txtNote;//文本框
var txtLimit;//提示字数的input
var limitCount;//限制的字数
var isbyte;//是否使用字节长度限制(1汉字=2字符)
var txtlength;//到达限制时,字符串的长度
var txtByte;
this.init=function(){
txtNote=this.txtNote;
txtLimit=this.txtLimit;
limitCount=this.limitCount;
isbyte=this.isbyte;
txtNote.onkeydown=function(){wordsLimit()};txtNote.onkeyup=function(){wordsLimit()};
txtLimit.value=limitCount;
}
function wordsLimit(){
var noteCount=0;
if(isbyte){noteCount=txtNote.value.replace(/[^/x00-/xff]/g,"xx").length}else{noteCount=txtNote.value.length}
if(noteCount>limitCount){
if(isbyte){
txtNote.value=txtNote.value.substring(0,txtlength+Math.floor((limitCount-txtByte)/2));
txtByte=txtNote.value.replace(/[^/x00-/xff]/g,"xx").length;
txtLimit.value=limitCount-txtByte;
}else{
txtNote.value=txtNote.value.substring(0,limitCount);
txtLimit.value=0;
}
}else{
txtLimit.value=limitCount-noteCount;
}
txtlength=txtNote.value.length;//记录每次输入后的长度
txtByte=txtNote.value.replace(/[^/x00-/xff]/g,"xx").length;
}
}
//javascript/6259